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A Comprehensive Guide To Resolve Yahoo Mail Error 999

Yahoo mail is considered to be one of the most popular free email services that are used by a huge number of people through the globe. Yahoo mail allows the Yahoo user to choose the screen view so that they can check the messages at any time as per their requirement. The essentiality of using Yahoo mail include, of course, receiving as well as sending messages. As this application has a simple and clean interface, it is very easy to access all types of emails from users. Despite the advancements, Yahoo mail users encounter some issues such as Yahoo mail error 999.

Well, in an unfortunate case, if you are also confronting the same issue, then you must solve it as soon as possible. Keeping that in mind, here in this article, we are going to discuss some incredible hacks that will surely help you to get rid of the error at the earliest possible. So, read the entire guide and resolve the issue on your own.

More about Yahoo Mail Error 999

Before going to the reasons and the solutions, you must know a little bit about this particular error. If you are a new user and getting this error, then do not get puzzled. Have a deep look at this article and fix the issue on your own.

Error 999 basically occurs when the user is trying to log into their own yahoo account. So, if you are also facing the same issue while logging in, then it indicates that your account is blocked temporarily. There are many fixes by which this error code can be fixed completely.

However, in most cases, the glitch can be resolved by cleaning out the cache data and cache history. So, have a look at the apparent fixes that are mentioned below.

Reasons behind Yahoo Mail Error 999

There are various reasons for which you might face this particular issue.

  • Sharing the internet gateway with others may be the most important reason for which you might get error 999. Because of unstable or weak internet connectivity, it may restrict you to use Yahoo mail properly.
  • If the browser is not allowed to accept cookies from Yahoo.
  • Sending or receiving an unexpectedly high amount of email at once can cause this issue and you are unable to send or receive an email on Yahoo.
  • Make sure that you are not working with a third-party software program or application to access Yahoo, otherwise, you may be blocked by Yahoo for a certain period.
  • Spyware or viruses that can change system settings, preventing you from accessing some websites.
  • Very high activity from either your mobile device, computer, or IP address to specific Yahoo pages is one of the main reasons for getting this particular error code.

How to Fix Yahoo Mail Error 999? Step-by-Step Instructions

Try these troubleshooting methods by which you can definitely get rid of the error code.

Method 1: Update the Yahoo Account

If you are using an android device, then these steps are applicable for you. To update your Yahoo account, first, navigate to the Application tab and click on it. After that, choose “search” and tap on it. In the Search box type, ‘Yahoo mail’. Now, tap on Yahoo mail from the list of the suggestions. After that, select Update and let the application to update automatically. If you find the option is labeled as ‘Install’, then click on it and complete the update process.

If you are using an iOS device, then first, navigate to the “App Store”. Now, select Yahoo Mail and tap on it. Now, choose Update and keep waiting for a while. After completing the process, try to log in with the credentials and check if the error gets solved or still appearing.

Method 2: Try another Device

Most of the time it occurs that your device does not support the Yahoo mail account. In those cases, you should use another device to get rid of the issue. Download and install the Yahoo application on a compatible device. Now, log in with credentials and check if the Yahoo mail error 999 is existing or not. If not, then assume that there must be something wrong with your previous device. But, in case, if the code still persists, then move to the next step that is mentioned below.

Method 3: Sign Out and Sign In

We are receiving a number of complaints that this particular error occurs when the users sign out from their account for the first time. So, it is recommended, to wait for five to ten minutes and then, try to sign into your Yahoo mail account. So, a little patience can solve the issue at an instant.

Method 4: Update the Operating System

First, you press the Start icon from the Taskbar. Now, choose the Gear button and open the “Settings Window.” After that, locate and select the category “Update & Security” from that tab. You can notice a new window is popping up on the display screen. Select “Windows Update’ icon and click on “Check for updates.” Then, to update the OS, click on this icon and proceed with the step. It will help you to find the compatible updates for your device. In case, if an update is available for your device, then click on it and download the update as well. Choose the Install icon, when the download is over.

Method 5: Clear Caches from the Account

If you are using an android device, then these steps are applicable for you. Hence, follow the steps exactly in the same direction. The first thing you have to do is to open the Android settings app. After that, choose Apps and click on it. Now, choose the Application Manager option by clicking on it. Then, navigate to the Yahoo Mail application. Go to the Storage option and tap on it. After that, choose Clear Data and Clear Cache. Keep waiting for some time while the cleaning process is going on. Now, try to log in with your ID and password and verify whether the error still exists or not.

Method 6: Enable JavaScript

As an alternative process, you may choose this one as well. To go through this step you must navigate to the Tools menu. After that, go to the Internet options and click on it. Then, choose the Security tab by tapping on it. Then, choose the “Custom level” option and move to the next step. With the help of the pointer, scroll down and change the active Scripting setting as per your choice. Then, tap on Confirm and save the changes. Finally, exit from the Internet options. By this process, you will successfully enable the Javascript option.


Hopefully, you will be able to resolve the Yahoo mail error 999 matter with the help of the above-mentioned fixes. But, in any case, if you find any sort of difficulties, then seek an expert’s help. Moreover, you can also give your valuable feedback in the comment box below.